update loaing

lib/core/widgets/custom_button.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 
 import 'package:worker/core/theme/colors.dart';
+import 'package:worker/core/widgets/loading_indicator.dart';
 
 /// Button variant types for different use cases.
 enum ButtonVariant {
@@ -106,14 +107,7 @@ class CustomButton extends StatelessWidget {
   /// Builds the button content (text, icon, or loading indicator)
   Widget _buildContent() {
     if (isLoading) {
-      return const SizedBox(
-        width: 20,
-        height: 20,
-        child: CircularProgressIndicator(
-          strokeWidth: 2,
-          valueColor: AlwaysStoppedAnimation<Color>(Colors.white),
-        ),
-      );
+      return const CustomLoadingIndicator(size: 20, color: Colors.white);
     }
 
     if (icon != null) {